Well you’re going to have a hard time finding a 128 prepaid phone to begin with.

You’re going to have a hard time finding in stock iPhone 11

You’re going to have a mildly difficult time finding an unlocked phone with your standards.

If price isn’t an issue I’d recommend Amazon. Since you’re going for the 11 I’d guess price is the issue tho. I might be wrong. Are you at least 18?

(Don’t worry I’m not trying to sell you rn, I’m not on commission for this one)